Holly: Boron deficiency categories: Holly Holly Diseases Ornamentals Shrubs revision date: 2022-12-02 12:00 Necrotic spotting on leaves from boron deficiency Photo by: R.S. Byther Biology Boron deficiency in holly is characterized by the appearance of spots on the leaves. The spots initially are red to purple and irregularly shaped on the upper surface. They appear […]
Holly: Green algae categories: Holly Holly Diseases Ornamentals Shrubs revision date: 2022-12-05 12:00 Green algae on hollyPhoto by: B.M. Johnson Biology Green algae grows on the surface only of leaves, twigs, and trunks. Wet, humid weather favors development of these microscopic, moisture-loving, primitive plants. The colonized holly is not harmed unless sufficient algal growth develops […]
Holly: Phytophthora leaf & twig blight categories: Holly Holly Diseases Ornamentals Shrubs revision date: 2022-12-02 12:00 Holly Phytophthora leaf and twig blightPhoto by: J.W. Pscheidt Biology Leaf and twig blight of holly is caused by a different Phytophthora species than is associated with root rots. Symptoms first appear in the fall and winter during wet, […]
Holly: Red leaf spotting categories: Holly Holly Diseases Ornamentals Shrubs revision date: 2022-12-02 12:00 Holly red leaf spottingPhoto by: J.W. Pscheidt Biology Red leaf spotting of holly is a general category which includes physical or pesticide damage, nutritional deficiency, and disease symptoms. Damage from the holly’s own spines can cause leaves to develop red or […]